Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b16d1781ccf4f9a…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 08:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8545474436513d91fcffa467f4952f14 SHA-1: 75614bbcea5afa4f867886d5038ab4f21e634633 SHA-256: 9b16d1781ccf4f9abd99791b888fbeb5a98b290eafe044bda970d10b4d717d15
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=among+us+free+pets+apk+download PDF link annotation
    • https://pindimana.in/uploads/file/47043095368.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/werelofirezirekus.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/dazog.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/pekuburuw.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210903045858.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/63782121343.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/liduvelegi.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/72422525403.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/lebugogugejizozojetu.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/98246298865.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/petizasoginibanaz.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/pexubijetutedefomiwa.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/wepodajisalemovu.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/86820992833.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/22664591162.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/nogobofuvoj.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/55147119803.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/34004157947.pdfIn PDF document text
    • http://lagrupacio.cat/file/ponosubev.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109172321333578.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/mukowotivekiw.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/47685601827.pdfIn PDF document text
    • http://ljsmelt.com/upload/files/25543972429.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB15 18484 bytes
SHA-256: 1fa1248e314f3a83f2f2bab04f161b638d97bb592014b5b57b9180723ea89fc1
font_01_sfnt_off00010b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12326 11008 bytes
SHA-256: b16d91538ff22309ec3244d3c21960d4699a9d5e010228166f791fcac9eaacde

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